No. of Recommendations: 2
I like the concept but see limited use. A SSD cache for a hard drive has two applications that make sense: in the event of a power loss, protecting data that needs to be written to the disk but is still queued for write; and "priming" the drive for power-up so the OS loads more quickly. You could imagine that returning from hibernate might be lots faster, if it's set up correctly.

At the same time, the SSD/HDD combination has some of the same flaws as SSD. I think the biggest one is that SSD memory "wears out" more quickly than magnetic storage - has far fewer available write cycles.

Another thing common with the hybrids is that the disk actually spins down when it's idle. That bothers me, both because the next random read request is going to take a LOT longer (assuming it's not cached), and because the drive gets a lot more mechanical wear during power up/down. Also, there's fundamentally no difference between an SSD drive (or SDD cache on HDD) and a thumb drive, and I think most peoples' experience with thumb drives is that they aren't practical for long-term use.

So where's the application? Definitely not in enterprise storage. Probably not on home PCs. Laptops seem like a reasonable choice for the added protection for sudden power failure and impact damage to a spinning platter.
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